There isn't exactly an "easy way" to do it, but don't get discouraged-- This is something that takes time and practice, not some sort of special skill that only some people possess.
Bold canceling is only difficult until you've done it enough times that it becomes second nature, and it's an incredibly useful tool that makes Dante a very unique and versatile character, so keep it up!

easiest way to learn solo combos is to look up videos, as suggested already

if you want to make up your own stuff, just play around in training mode, try things out, if they don't work, try something else, rinse and repeat.

most importantly though, make sure you understand how not only your specific character's moves work into his combos, but also the general mechanics of umvc3 combos (ex. only one wallbounce/groundbounce in a combo, hitstun/damage scaling, etc.), which you can probably find somewhere on SRK forums or youtube, or even just googling it should turn up something useful.

Really? I came to marvel off of AE and I found the execution to be much more lenient in marvel because the links in AE are waaaaaay more strict.
Granted, marvel combos are a lot faster and longer, so I suppose the difficulty of execution depends on what gets you more-- fast inputs or strict links